Sources, and what we would not quote
A short list, and an unusually long note about what is missing from it.
The one government source retrieved
- California Legislature, Assembly Bill 1942, 2009 to 2010 regular session, as introduced 17 February 2010. Source of the Legislative Counsel's Digest quoted in section three, describing the existing prohibition on objects obstructing the driver's clear view and the proposed exemption for a video event recorder mounted in a seven-inch square in the lower corner of the windshield farthest from the driver or a five-inch square in the lower corner nearest the driver and outside an airbag deployment zone. California Legislature.
Why that source carries a warning rather than a citation alone. It is the introduced version of a bill from 2010, not current codified text, so the provision as enacted and subsequently amended may differ. We quote it because it was the only government source for these dimensions retrieved during this build and because the structure it shows, a general prohibition with a specific carve-out, is what a reader should look for in their own state. The same discipline was applied on our workers compensation guide, which quotes a 2009 enrolled bill and says so.
What we described rather than quoted, and why that is a weaker claim than it looks. California is referred to as an example of a state requiring the consent of all parties, and its provision is neither quoted nor cited to a section. That is because we did not retrieve the statute during this build at all: both the existence of the provision as we have described it and its wording rest on secondary sources. Paraphrasing the effect of a criminal statute is defensible. Presenting somebody else's summary as statutory language is not, particularly on a page where a reader might act on it.
What we deliberately did not publish at all. There is no list of which states require the consent of all parties. Such lists are everywhere and we retrieved no primary source for one. On a subject where recording without required consent can be a criminal offense, a single wrong entry in a table would be worse than publishing nothing, and a reader needs only one state's answer anyway. Section six explains how to get it.
A note on the other state pages. Our statistics by state, most dangerous highways and trucking laws by state guides also decline to tabulate fifty rows, but for a different reason: there the underlying material barely varies, or was not verifiable. Here it genuinely varies, and that is precisely what makes an unverified table hazardous rather than merely unhelpful.